Coordinated coil scheduling method of multiple production lines for cold rolling area in steel plant

Abstract

The present invention provides a coordinated coil scheduling method of multiple production lines in cold rolling area in steel plant, comprising: acquiring the information about the candidate coils to be scheduled in each of the multiple production lines in cold rolling area; building a coordinated coil scheduling model of multiple lines; obtaining the initial coordinated coil schedule of multiple lines by using a heuristic algorithm; improving the initial coordinated coil schedule in real time; and sending the improved coordinated coil schedule to the ACS of each production line. In this method, besides different production technological requirements of each coil, the cohesion relationship of different production lines are taken into account to make material supply to each equipment reasonable, and the smooth production process of coils in each of the lines is guaranteed with the changeover minimized, such that the whole efficiency of the manufacturing process is improved.

Description

TECHNICAL FIELD[0001]The present invention belongs to the field of information technology for manufacturing in metallurgy and relates to the field of automation technology, and more specifically, to a coordinated coil scheduling method of multiple production lines in cold rolling area in steel plant.BACKGROUND ART[0002]Coordination scheduling of metal materials for multiple lines in cold rolling area is an important part in the production operations for metallurgic enterprises. The effectiveness of the coordinated schedule has directly relationship on the stability of equipments and the operation efficiency in the multiple production lines in cold rolling area, and, on the quality of the final product and the production cost.[0003]Taking the steel plant as an example, the cold rolling area comprises multiple production stages, such as, acid pickling, acid rolling, continuous annealing, hot galvanizing, hot galvanizing and aluminizing, finishing, electro-tinning, crosscutting, rewind...

AI Technical Summary

Benefits of technology

[0043](1) Not only different production technological requirements but also the cohesion relationship between different production lines in cold rolling area are taken in to account in the method of the present invention, so as to equilibrate material supply of the lines, and to guarantee a steady and smoothly production of coils in the lines and finally to improve the overall efficiency of the production in cold rolling area.

[0044](2) Compared to manual production schedule, the total changeover times are reduced, and the frequency of equipment adjustment is reduced, thereby improving the quality of the product and production efficiency.

[0045](3) Since there are similarities between the process in steel plant and that of production of other metals, the method of the present invention can be easily applied to production of other kinds of metals.

Problems solved by technology

The hot rolled coils will be processed to be cold rolled coils in acid-rolling line, which can be directly sold, however, cold hardening caused by continuous cold deformation will lead to the increasing the strength and hardness of the coils and reducing the toughness, consequently, deteriorating the stamping characteristic.

Further, the coils are processed continuously in each production line, the processing of the coil cannot be started in the downstream production line until it is finished in the upstream production line, thus, the coil will be reprocessed or become wasted material, if its terrible defect incurred in the upstream production line is not be repaired in the downstream production line.

However, the practical production conditions are various, and often involve several decision makers, so that the current manual planning method could not effectively coordinate the production rhythms among the lines and determining the schedule with good performance, thus causing conflicts among the lines and increasing the changeover times, which couldn't guarantee the production stability and the quality of the product.

Each line may have different scheduling requirements to be taken into account thus causing conflicts between the coil schedules in different lines.

If a coil schedule is made with only consideration of the scheduling requirements of a line, other lines may be negatively influenced and suffer from frequent changeover and material shortage, resulting in a high changeover costs.

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